#include "ADuCM4050.h"

void delay_ms(unsigned int ms)
{
	SysTick->LOAD = 26000000/1000-1; // Count from 255 to 0 (256 cycles)  载入计数值 定时器从这个值开始计数
	SysTick->VAL = 0; // Clear current value as well as count flag  清空计数值到达0后的标记
	SysTick->CTRL = 5; // Enable SysTick timer with processor clock  使能52MHz的系统定时器
	while(ms--)
	{
		while ((SysTick->CTRL & 0x00010000)==0);// Wait until count flag is set  等待
	}
	SysTick->CTRL = 0; // Disable SysTick  关闭系统定时器
}
void delay_us(unsigned int us)
{
	SysTick->LOAD = 26000000/1000/1000-1; // Count from 255 to 0 (256 cycles)  载入计数值 定时器从这个值开始计数
	SysTick->VAL = 0; // Clear current value as well as count flag  清空计数值到达0后的标记
	SysTick->CTRL = 5; // Enable SysTick timer with processor clock  使能52MHz的系统定时器
	while(us--)
	{
		while ((SysTick->CTRL & 0x00010000)==0);// Wait until count flag is set  等待
	}
	SysTick->CTRL = 0; // Disable SysTick  关闭系统定时器
}

